#include <jni.h>
#include <string>

extern "C" JNIEXPORT jstring JNICALL
Java_com_example_testndk_MainActivity_stringFromJNI(
        JNIEnv* env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    return env->NewStringUTF(hello.c_str());
}

/*
 * Class:     com_example_testndk_MainActivity
 * Method:    doCallBack
 * Signature: ()V
 */
extern "C" JNIEXPORT void JNICALL Java_com_example_testndk_MainActivity_doCallBack
        (JNIEnv* env, jobject){

}